<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头部logo -->
            <div class="avatar_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <!-- 登录区域 -->
            <el-form ref='formRef' :model='loginForm' :rules='rules' label-width="0px" class="login_form">
                <!-- 用户名 -->
                <el-form-item prop='username'>
                    <el-input v-model='loginForm.username' prefix-icon="iconfont icon-user"></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop='password'>
                    <el-input type='password' v-model='loginForm.password' prefix-icon="iconfont icon-3702mima">
                    </el-input>
                </el-form-item>
                <!-- 按钮 -->
                <el-form-item class="btns">
                    <el-button type="primary" @click='login'>登录</el-button>
                    <el-button type="info" @click='reset'>重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
    export default {
        data() {
            return {
                // 登录表单的数据绑定对象
                loginForm: {
                    username: 'admin',
                    password: '123456'
                },
                // 表单的验证规则
                rules: {
                    // 验证用户名是否合法
                    username: [
                        { required: true, message: '请输入登录名称', trigger: 'blur' },
                        { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                    ],
                    // 验证密码是否合法
                    password: [
                        { required: true, message: '请输入登录密码', trigger: 'blur' },
                        { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                    ]
                }
            }
        },
        methods: {
            // 点击重置按钮，重置登录表单
            reset() {
                // console.log(this);
                this.$refs.formRef.resetFields();
            },
            login() {
                // 先对表单进行提交前的预验证
                this.$refs.formRef.validate(async flag => {
                    if (!flag) return;
                    // 发送登录请求
                    // 对象解构获取data 数据
                    const { data: res } = await this.$axios.post('login', this.loginForm);
                    if (res.meta.status !== 200) return this.$message.error('登录失败');
                    this.$message.success('登录成功');
                    // 把登录成功之后的token 保存到客户端的sessionStorage中
                    sessionStorage.setItem('token', res.data.token);
                    // 登录成功后跳转到后台主页
                    this.$router.push('/home')
                })
            }
        }
    }
</script>

<style lang="less" scoped>
    .login_container {
        background-color: #2b4b6b;
        height: 100%;
    }

    .login_box {
        width: 450px;
        height: 300px;
        background-color: #fff;
        border-radius: 3px;
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
    }

    .avatar_box {
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%, -50%);
        background-color: #fff;
    }

    img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
    }

    .btns {
        display: flex;
        justify-content: flex-end;
    }

    .login_form {
        position: absolute;
        bottom: 0;
        width: 100%;
        padding: 0 20px;
        box-sizing: border-box;
    }
</style>